PWS_Council Bluffs Trees 3.20.23.pdf

PERFORMANCE WORK STATEMENT (PWS)

Tree Planting in Council Bluffs, Iowa

1.0 General Information.

1.1 Background. Trees will be planted at a site on the Missouri River in Council Bluffs as a mitigation requirement for the MO River LB & Indian Creek RB Levee Rehabilitation Project.

1.2 Scope of Work. This is a non-personal services contract to plant 66 trees at a designated location on the Missouri River in Council Bluffs (see Attached drawing L-101). Work includes providing trees, planting, staking, guying and installation of no less than 66 stems. Trees shall be watered and maintained through the plant establishment period (see Attached 32 93 00). This is a fixed price, performance based acquisition where the government defines and measures desired outcomes, while contractor methods are generally not constrained or directed.

1.3 Period of Performance. The period of performance shall be 15 months from date of award. This includes 12 month maintenance and watering period.

1.4 Contractor Personnel

1.4.1 The contractor shall perform all work under this contract using his or her own forces except as provided in Paragraph 1.4.2 Subcontracting. Employees who perform this work shall be qualified persons on the contractor’s own payroll.

1.4.2 Subcontracting. The contractor shall not subcontract any work without written approval of the Contracting Officer. Compliance with the provisions of this contract by subcontractors shall be the responsibility of the contractor.

1.5 Quality Control

1.5.1 The contractor shall designate, in writing, an employee who shall serve as the contact for matters involving quality and performance or nonperformance of the required work stated in this PWS. The employee(s) shall be qualified and fully competent with full authority to act for, and on behalf of, the contractor as necessary to insure that the required work is performed in accordance with the standards contained herein. The contractor shall furnish the above written designation to the COR no later than the first day of work. The contractor shall include the name(s), address(s), and telephone number(s) of the responsible individual(s).

1.5.2 The Contracting Officer reserves the right to disapprove any individual whom he considers incompetent to perform the work required. The Contracting Officer will provide a written notice of any disapproval to the contractor.

1.6 Quality Assurance. The government will use a Quality Assurance Surveillance Plan (QASP) to ensure that the Contractor is performing the services required by this PWS in an acceptable manner. The Government may use Quality Assurance Evaluators (QAE(s)) to provide assistance with the quality assurance methods.

1.6.1 See Attached 32 93 00. The government has the right to inspect all services called for by the contract, to the extent practicable at all times and places during the term of the contract. The government shall perform inspections in a manner that will not delay the work.

1.6.2 If any of the services do not conform to contract requirements, the government may require the contractor to perform the services in conformity with contract requirements and at no increase in cost. If the contract requirements are not met after a second attempt the government may (1) require the contractor to take necessary action to ensure that future performance conforms to contract requirements and (2) reduce the contract price to reflect the reduced value of the services performed.

1.6.2.1 Upon verification of a validated customer complaint or corrective action report, the COR will notify the contractor that they are required to re-perform specific services.

1.6.3 The government may take action, if the contractor fails to perform the services again or to take the necessary action to ensure future performance is in conformity with the contract requirements. The government may (1) by contract, or otherwise, perform the services and charge to the contractor any cost incurred by the government that related to the performance of such service or (2) terminate the contract in whole or in part

1.6.4 The contractor is responsible to replace/repair any damage to government property due to negligence, at his or her own cost. The government may take action, if the contractor fails to replace/repair any damage to government property. The government may (1) by contract, or otherwise, replace/repair damaged government property and charge to the contractor any cost incurred by the government to replace/repair any damage.

1.7 Access. The contractor shall coordinate with COR and/or City of Council Bluffs to gain access to site via gated roads.

1.8 Pre-Work Meeting. Prior to commencing any activities, the contractor shall arrange a Pre-work Meeting with the COR. The Meeting shall discuss the work requirements, scheduling, submittal process, review of the Activity Hazard Analysis (AHA), and Abbreviated Accident Prevention Plan (AAP). At least one (1) week prior to commencing work, the Contractor shall coordinate their proposed work schedule with the COR.

1.9. Submittals. Prior to commencement of services, the Contractor shall submit the following documents to the COR for review and approval:

a. Activity Hazard Analysis (AHA)

b. Abbreviated Accident Prevention Plan (APP)

c. Proof of Insurance for Contractors and Subcontractors

d. Submittal requirements in Attached 32 93 00

1.10 Standards and Regulations. The Contractor shall perform to the standards in the contract and comply with all Local, State, and Federal Regulations during the services performed. The Contractor is responsible for ascertaining the extent to which these regulations affect the operations resulting from this contract. The Contractor shall comply will all applicable regulations. Applicable regulations include, but are not limited to the following:

a. Code of Federal Regulations (CFR), Title 36, Chapter III, Part 327, Rules and Regulations Governing Public Use on Corps of Engineers Water Resource Development Projects EP 1165-2-316 (http://www.publications.usace.army.mil/Portals/76/Publications/EngineerPamphlets/EP_1165-2- 316.pdf?ver=2013-08-22-104526-670)

b. Engineering Manual (EM) 385-1-1 (USACE – Safety and Health Requirements Manual), dated November 2014; http://www.publications.usace.army.mil/Portals/76/Publications/EngineerManuals/EM_385-1-1.pdf

c. Occupational Safety and Health Standards (29 CFR 1910);

1.10.1 Activity Hazard Analysis (AHA). The contractor shall prepare the AHA in accordance with Paragraph 01.A.14 or 01.A.15 of the EM 385-1-1. If using Paragraph 01.A.15, prepare the AHA IAW Figure 1-2.

Note: Contractors and other individual employer’s typically use Job Safety Analyses (JSAs), Job Hazard Analyses (JHAs), or similar Risk Management assessment tools. The government considers equivalent to, and acceptable substitutes for, the USACE’s AHA provided the data collected is the same as that required by the AHA, commensurate with the type of services the contractor is performing.

1.10.2 Abbreviated Accident Prevention Plan (APP). EM 385-1-1 in its entirety may be too complex for the type of work performed under these contracts; contractors may reference Appendix A, for abbreviated Accident Prevention Plan (APP). The contractor shall only need to submit items in Appendix A that are pertinent to the contract. The contractor shall use a qualified person to prepare the site-specific abbreviated Accident Prevention Plan (APP). The contractor shall prepare the APP in accordance with the format and requirements of the EM 385-1-1 and supplemented herein. The contractor shall sign and submit the APP for approval prior to the start of work onsite.

1.11 Physical Security

http://www.publications.usace.army.mil/Portals/76/Publications/EngineerPamphlets/EP_1165-2-316.pdf?ver=2013-08-22-104526-670 http://www.publications.usace.army.mil/Portals/76/Publications/EngineerPamphlets/EP_1165-2-316.pdf?ver=2013-08-22-104526-670 http://www.publications.usace.army.mil/Portals/76/Publications/EngineerManuals/EM_385-1-1.pdf

1.11.1 Government facilities, property, and materials. N/A

1.11.2 Key Control. N/A

1.12 Antiterrorism/Operation Security Requirements. N/A

1.13 Payment

1.13.1 The government will make payment upon completion of all services, after the government has inspected and accepted the services, and the government has reviewed, approved, and processed the contractor’s invoice. The contractor shall submit the invoice to the COR and/or any other person that has been designated in the contract to receive the invoice.

1.13.2 The contractor must provide the contractor’s name, address, contract number, period of services completed (i.e., for the month of January or for the period of performance of January 1 through February 23), CLIN number and specific quantities of work performed (i.e., 1 Month, 40 days, 100 acres, etc.), and total requested, for an invoice to be considered proper. The contractor shall submit the invoice by the fifth (5th) of the month for services completed the previous month or submit the invoice upon completion of all services, in accordance with the period of performance stated in the CLIN.

2.0 Definitions. The following definitions and descriptions apply wherever the word(s) or phrase(s) is/are stated in this PWS:

Acceptable Level of Performance (ALP): The maximum percent defective, the maximum number of defects per hundred units, or the number of defects in a lot considered satisfactory on the average. The allowable leeway or variance from a standard before the government will reject the specific service.

Contracting Officer’s Representative (COR): means an individual designated and authorized in writing by the Contracting Officer to perform specific technical or administrative functions.

Performance-Based Contract (FAR 2.101): Structuring all aspects of an acquisition around the purpose of the work to be performed with the contract requirements set forth in clear, specific, and objective terms with measurable outcomes as opposed to either the manner by which the work is to be performed or broad and imprecise.

Performance Requirements Summary (PRS): The PRS shows contract requirements, the component requirements related to each contract requirement, the price of each work requirement as a percentage of the associated contract requirement (Fixed Price Contracts), the standard of performance, and the acceptable level of performance (ALP) for each work requirement.

Quality Assurance Surveillance Plan (QASP): An organized written document used by the Government for quality assurance surveillance. Document contains sampling/evaluation guides, checklists, and the performance requirements summary (PRS).

3.0 Government Furnished Items and Services. N/A

4.0 Contractor Furnished Items and Responsibilities

4.1 General. The Contractor shall furnish all supplies, equipment, facilities and services required to perform work under this contract that are not listed under Section 3 of this PWS.

5.0 Specific Tasks

5.1 Basic Services. See Attached 32 93 00.

6.0 Performance Requirements Summary. The contractor service requirements are summarized into performance objectives that relate directly to mission essential items. The performance threshold briefly describes the minimum acceptable levels of service required for each requirement. These thresholds are critical to mission success.

Performance Objective (The Service required— usually a shall statement)

Standard Performance Threshold (This is the maximum error rate. It could possibly be “Zero deviation from standard”)

Method of Surveillance

PRS # 1.

The contractor shall plant trees in accordance with Paragraph 5.1.

PRS # 2.

The contractor shall maintain trees through establishment period in accordance with Paragraph 5.1.

PRS # 3.

All plants shall be guaranteed in accordance with Paragraph 5.1.

The contractor has provided all plants and provided installation and maintenance as listed in this

PWS.

Zero deviation from Standard 100% Inspection by the COR.

7.0 Attachments

Attachment 1 – Technical Specifications Attachment 2 – Drawing L-101, Tree Mitigation Planting Area

Attachment 1 Technical Specifications

CB Flood Protection, 2019 Levee Rehab, Coucil Bluffs, IA MRQ5

SECTION TABLE OF CONTENTS

DIVISION 32 - EXTERIOR IMPROVEMENTS

SECTION 32 93 00

EXTERIOR PLANTS

03/23

PART 1 GENERAL

1.1 REFERENCES

1.2 RELATED REQUIREMENTS

1.3 SUBMITTALS

1.4 QUALITY ASSURANCE

1.4.1 Nursery Certifications

1.5 DELIVERY, STORAGE, AND HANDLING

1.5.1 Delivery

1.5.1.1 Branched Plant Delivery

1.5.1.2 Plant Labels

1.5.2 Storage

1.5.2.1 Plant Storage and Protection

1.5.3 Handling

1.5.4 TIME LIMITATION

1.6 TIME RESTRICTIONS AND PLANTING CONDITIONS

1.6.1 Planting Dates

1.6.2 Restrictions

1.7 GUARANTEE

PART 2 PRODUCTS

2.1 PLANTS

2.1.1 Regulations and Varieties

2.1.2 Shape and Condition

2.1.2.1 Deciduous Trees and Shrubs

2.1.2.2 Evergreen Trees and Shrubs

2.1.3 Plant Size

2.1.4 Root Ball Size

2.1.4.1 Mycorrhizal fungi inoculum

2.1.5 Growth of Trunk and Crown

2.1.5.1 Deciduous Trees

2.1.5.2 Broadleaf Evergreen Plant Material

2.1.6 Trees

2.2 STAKING AND GUYING MATERIAL

2.2.1 Staking Material

2.2.1.1 Tree Support Stakes

2.2.1.2 Ground Stakes

2.2.2 Guying Material

2.2.2.1 Guying Wire

2.2.2.2 Guying Cable

2.2.3 Hose Chafing Guards

2.2.4 Flags

2.3 EROSION CONTROL MATERIALS

2.3.1 Erosion Control Blanket

2.3.2 Erosion Control Net

SECTION 32 93 00 Page 1

2.3.3 Hydrophilic Colloids

2.3.4 Erosion Control Material Anchors

2.4 WATER

2.5 MYCORRHIZAL FUNGI INOCULUM

2.6 SOURCE QUALITY CONTROL

PART 3 EXECUTION

3.1 EXTENT OF WORK

3.2 APPLICATION OF HERBICIDE

3.3 PREPARATION

3.3.1 Layout

3.3.2 Soil Preparation

3.3.2.1 Fertilizer Application Rates

3.4 PLANT BED PREPARATION

3.5 PLANT INSTALLATION

3.5.1 Individual Plant Pit Excavation

3.5.2 Handling and Setting

3.5.2.1 Balled and Burlapped Stock

3.5.2.2 Bare-Root Stock

3.5.2.3 Container Grown Stock

3.5.3 Earth Mounded Watering Basin for Individual Plant Pits

3.5.4 Tree Wrapping and Protection

3.5.5 Weed Control Barrier

3.5.6 Tree and Shrub Caging

3.5.7 Erosion Control Material

3.5.8 Mulch Topdressing

3.5.9 Watering

3.5.10 Staking and Guying

3.5.10.1 Staking

3.5.10.2 Guying

3.5.10.3 Chafing Guards

3.5.10.4 Wood Ground Stakes

3.5.10.5 Flags

3.5.11 Pruning

3.5.11.1 Trees and Shrubs

3.5.11.2 Wound Dressing

3.6 MAINTENANCE DURING PLANTING OPERATION

3.7 RESTORATION AND CLEAN UP

3.7.1 Restoration

3.7.2 Clean Up

-- End of Section Table of Contents --

SECTION 32 93 00 Page 2

SECTION 32 93 00

EXTERIOR PLANTS

03/23

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICANHORT (AH)

ANSI/ANLA Z60.1 (2004) American Standard for Nursery Stock

ASTM INTERNATIONAL (ASTM)

ASTM A580/A580M (2018) Standard Specification for Stainless Steel Wire

L.H. BAILEY HORTORIUM (LHBH)

LHBH (1976) Hortus Third

TREE CARE INDUSTRY ASSOCIATION (TCIA)

TCIA A300P1 (2017) ANSI A300 Part1: Tree Care Operations - Trees, Shrubs and Other Woody Plant Maintenance Standard Practices - Pruning

TCIA Z133 (2017) American National Standard for Arboricultural Operations - Pruning, Repairing, Maintaining, and Removing Trees, and Cutting Brush - Safety Requirements

1.2 RELATED REQUIREMENTS

1.3 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government.

SD-01 Preconstruction Submittals

Time Restrictions and Planting Conditions

SECTION 32 93 00 Page 3

Indicate anticipated dates for installation and locations for each type of planting in a planting plan

SD-03 Product Data

Ground Stakes

Staking Material

Erosion Control Materials

SD-07 Certificates

Nursery Certifications

SD-10 Operation and Maintenance Data

When not labeled, identify types in Operation and Maintenance Manual.

1.4 QUALITY ASSURANCE

1.4.1 Nursery Certifications

a. Indicate on nursery letterhead the name of plants in accordance with the LHBH, including botanical common names, quality, and size.

b. Inspection certificate.

c. Mycorrhizal fungi inoculum for plant material treated

1.5 DELIVERY, STORAGE, AND HANDLING

1.5.1 Delivery

1.5.1.1 Branched Plant Delivery

Deliver with branches tied and exposed branches covered with material which allows air circulation. Prevent damage to branches, trunks, root systems, and root balls and desiccation of leaves.

1.5.1.2 Plant Labels

Deliver plants with durable waterproof labels in weather-resistant ink.

Provide labels stating the correct botanical and common plant name and variety as applicable and size as specified in the list of required plants. Attach to plants, bundles, and containers of plants. Groups of plants may be labeled by tagging one plant. Labels must be legible for a minimum of 60 days after delivery to the planting site.

1.5.2 Storage

1.5.2.1 Plant Storage and Protection

Store and protect plants not planted on the day of arrival at the site as follows:

a. Shade and protect plants in outside storage areas from the wind and

SECTION 32 93 00 Page 4 direct sunlight until planted.

b. Heel-in bare root plants.

c. Protect balled and burlapped plants from freezing or drying out by covering the balls or roots with moist burlap, sawdust, wood chips, shredded bark, peat moss, or other approved material. Provide covering which allows air circulation.

d. Keep plants in a moist condition until planted by watering with a fine mist spray.

e. Do not store plant material directly on concrete or bituminous surfaces.

1.5.3 Handling

Do not drop or dump plants from vehicles. Avoid damaging plants being moved from nursery or storage area to planting site. Handle plants carefully to avoid damaging or breaking the earth ball or root structure.

Do not handle plants by the trunk or stem. Puddle bare-root plants after removal from the heeling-in bed to protect roots from drying out. Remove damaged plants from the site.

1.5.4 TIME LIMITATION

Except for container-grown plant material, the time limitation from digging to installing plant material must be a maximum of 90 days. The time limitation between installing the plant material and placing the mulch must be a maximum of 24 hours.

1.6 TIME RESTRICTIONS AND PLANTING CONDITIONS

1.6.1 Planting Dates

Plant all plants from April 1 to October 15.

1.6.2 Restrictions

Do not plant when ground is frozen, muddy, or when air temperature exceeds 90 degrees Fahrenheit.

1.7 GUARANTEE

All plants must be guaranteed for one year beginning on the date of inspection by the Contracting Officer to commence the plant establishment period, against defects including death and unsatisfactory growth, except for defects resulting from lack of adequate maintenance neglect, or abuse by the Government or by weather conditions unusual for the warranty period.

Remove and replace dead planting materials immediately unless required to plant in the succeeding planting season. At end of warranty period, replace planting materials that die or have 25 percent or more of their branches that die during the construction operations or the guarantee period.

SECTION 32 93 00 Page 5

PART 2 PRODUCTS

2.1 PLANTS

2.1.1 Regulations and Varieties

Furnish nursery stock in accordance with ANSI/ANLA Z60.1, except as otherwise specified or indicated. Each plant or group of planting must have a "key" number indicated on the nursery certifications of the plant schedule. Furnish plants grown under climatic conditions similar to those in the locality of the project. Spray plants budding into leaf or having soft growth with an antidesiccant before digging. Plants of the same specified size must be of uniform size and character of growth. All plants must comply with all Federal and State Laws requiring inspection for plant diseases and infestation.

2.1.2 Shape and Condition

Well-branched, well-formed, sound, vigorous, healthy planting stock free from disease, sunscald, windburn, abrasion, and harmful insects or insect eggs and having a healthy, normal, and undamaged root system.

2.1.2.1 Deciduous Trees and Shrubs

Symmetrically developed and of uniform habit of growth, with straight boles or stems, and free from objectionable disfigurements.

2.1.2.2 Evergreen Trees and Shrubs

Well developed symmetrical tops with typical spread of branches for each particular species or variety.

2.1.3 Plant Size

Minimum sizes measured after pruning and with branches in normal position, must conform to measurements indicated, based on the average width or height of the plant for the species as specified in ANSI/ANLA Z60.1. Plant container size (i.e. no smaller than 3 gallon container) 3-foot to 5-foot tall trees. Plants larger in size than specified may be provided with approval of the Contracting Officer. When larger plants are provided, increase the ball of earth or spread of roots in accordance with

ANSI/ANLA Z60.1.

2.1.4 Root Ball Size

All box-grown, field potted, field boxed, collected, plantation grown, bare root, balled and burlapped, container grown, processed-balled, and in-ground fabric bag-grown root balls must conform to ANSI/ANLA Z60.1. All wrappings and ties must be biodegradable. Root growth in container grown plants must be sufficient to hold earth intact when removed from containers. Root bound plants will not be accepted.

2.1.4.1 Mycorrhizal fungi inoculum

Before shipment, root systems must contain mycorrhizal fungi inoculum.

SECTION 32 93 00 Page 6

2.1.5 Growth of Trunk and Crown

2.1.5.1 Deciduous Trees

A height to caliper relationship must be provided in accordance with ANSI/ANLA Z60.1. Height of branching must bear a relationship to the size and species of tree specified and with the crown in good balance with the trunk. The trees must not be "poled" or the leader removed.

a. Single stem: The trunk must be reasonably straight and symmetrical with crown and have a persistent main leader.

b. Multi-stem: All countable stems, in aggregate, must average the size specified. To be considered a stem, there must be no division of the trunk which branches more than 6 inches from ground level.

2.1.5.2 Broadleaf Evergreen Plant Material

Broadleaf evergreen plant material must have the height-to-spread ratio recommended by ANSI/ANLA Z60.1. Acceptable plant material must be well shaped and recognized by the trade as typical for the variety grown in the region of the project.

2.1.6 Trees

Scientific Name Common Name Number Planted

Acer saccharinum Silver Maple 10

Celtis occidentalis Hackberry 13

Platanus occidentalis American Sycamore 17

Gleditsia trisanthos Honeylocust 10

Populus deltoides Plains Cottonwood 10

Acer negundo Boxelder Maple 6

Total 66

The following species substitutions are allowed:

Scientific Name Common Name Number Planted

Juglans nigra Black Walnut Maximum 10

Catalpa speciose Catalpa Maximum 10

Quercus macrocarpa Bur Oak Maximum 10

SECTION 32 93 00 Page 7

2.2 STAKING AND GUYING MATERIAL

2.2.1 Staking Material

2.2.1.1 Tree Support Stakes

Rough sawn hard wood free of knots, rot, cross grain, bark, long slivers, or other defects that impair strength. Stakes must be minimum 2 inches square or 2-1/2 inch diameter by 8 feet long, pointed at one end. Paint or stain wood stakes dark brown.

2.2.1.2 Ground Stakes

Rough sawn hard wood or plastic, 2 inches square are by 3 feet long, pointed at one end.

2.2.2 Guying Material

2.2.2.1 Guying Wire

12 gauge annealed galvanized steel, ASTM A580/A580M.

2.2.2.2 Guying Cable

Minimum five-strand, 3/16 inch diameter galvanized steel cable.

2.2.3 Hose Chafing Guards

New or used 2 ply 3/4 inch diameter reinforced rubber or plastic hose, black or dark green, all of same color.

2.2.4 Flags

White surveyor's plastic tape, 6 inches long, fastened to guying wires or cables.

2.3 EROSION CONTROL MATERIALS

Erosion control material must conform to the following:

2.3.1 Erosion Control Blanket

70 percent agricultural straw/30 percent coconut fiber matrix stitched with a degradable nettings, designed to degrade within 12 months.

2.3.2 Erosion Control Net

Net must be heavy, twisted jute or coir fiber mesh, weighing approximately

1.22 pounds per linear yard and 4 feet wide with mesh openings of approximately one inch square.

2.3.3 Hydrophilic Colloids

Hydrophilic colloids must be physiologically harmless to plant and animal life without phytotoxic agents. Colloids must be naturally occurring, silicate powder based, and must form a water insoluble membrane after curing. Colloids must resist mold growth.

SECTION 32 93 00 Page 8

2.3.4 Erosion Control Material Anchors

Erosion control anchors must be as recommended by the manufacturer.

2.4 WATER

Source of water to be approved by Contracting Officer and suitable quality for irrigation and must not contain elements toxic to plant life.

2.5 MYCORRHIZAL FUNGI INOCULUM

Mycorrhizal fungi inoculum must be composed of multiple-fungus inoculum as recommended by the manufacturer for the plant material specified.

2.6 SOURCE QUALITY CONTROL

The Contracting Officer will inspect plant materials at the project site and approve them. Tag plant materials for size and quality.

PART 3 EXECUTION

3.1 EXTENT OF WORK

Provide tree, planting, staking, guying, and installation of no less than 66 stems as identified in 2.1.6.

3.2 APPLICATION OF HERBICIDE

When application of an herbicide becomes necessary to remove a pest or disease, an herbicide treatment plan shall be submitted and coordinated with the Contracting Officer's Representative. Refer to all applicable paragraphs of this specification.

A state certified applicator shall apply required herbicide in accordance with EPA label restrictions and recommendations. Clothing and personal protective equipment shall be used as specified on the herbicide label. A closed system is recommended as it prevents the herbicide from coming into contact with the applicator or other persons. Filling hoses shall be fitted with a backflow preventer meeting local plumbing codes or standards.

Overflow shall be prevented during the filling operation. Prior to each day of use, the equipment used for applying herbicide shall be inspected for leaks, clogging, wear, or damage. Any repairs are to be performed immediately. Contractor shall consult with Contracting Officer's Representative when wind speeds reach 7 mph or greater.

3.3 PREPARATION

3.3.1 Layout

Stake out approved plant material locations and planter bed outlines on the project site before digging plant pits or beds. The Contracting Officer reserves the right to adjust plant material locations to meet field conditions. Plant tree species randomly. Do not plant in rows. Plant trees 8 to 16 feet apart. Do not plant closer than 8 feet to the edge of the road. Do not plant closer than 15 feet to the landside or riverside levee toes.

SECTION 32 93 00 Page 9

3.3.2 Soil Preparation

3.3.2.1 Fertilizer Application Rates

Apply fertilizer at rates recommended by a nursery or arborist.

3.4 PLANT BED PREPARATION

Verify location of underground utilities prior to excavation. Protect existing adjacent turf before excavations are made. Where planting beds occur in existing turf areas, remove turf to a depth that will ensure removal of entire root system. Measure depth of plant pits from finished grade. Depth of plant pit excavation must be as indicated and provide proper relation between top of root ball and finished grade. Install plant material as specified in paragraph PLANT INSTALLATION. Do not install trees within 10 feet of any utility lines or building walls.

3.5 PLANT INSTALLATION

3.5.1 Individual Plant Pit Excavation

Excavate pits at least twice as large in diameter as the size of ball or container to depth shown.

3.5.2 Handling and Setting

Move plant materials only by supporting the root ball. Set plants on hand compacted layer of prepared backfill soil mixture 6 inches thick and hold plumb in the center of the pit until soil has been tamped firmly around root ball. Set plant materials, in relation to surrounding finish grade, one to 2 inches above depth at which they were grown in the nursery, c` ollecting field or container. Replace plant material whose root balls are cracked or damaged either before or during the planting process.

Plant material must be set in plant beds according to the drawings.

Backfill soil mixture must be placed on previously scarified subsoil to completely surround the root balls, and must be brought to a smooth and even surface, blending to existing areas.

3.5.2.1 Balled and Burlapped Stock

Backfill with prepared soil mixture to approximately half the depth of ball and then tamp and water. Carefully remove or fold back excess burlap and tying materials from the top a minimum 1/3 depth from the top of the rootball. Tamp and complete backfill, place mulch topdressing, and water.

Remove wires and non-biodegradable materials from plant pit prior to backfill operations.

3.5.2.2 Bare-Root Stock

Plant so roots are arranged in a natural position. Place roots in water a minimum of 30 minutes prior to planting. Carefully work prepared soil mixture among roots. Tamp remainder of backfill, place mulch topdressing and water.

3.5.2.3 Container Grown Stock

Remove from container and prevent damage to plant or root system.

SECTION 32 93 00 Page 10

3.5.3 Earth Mounded Watering Basin for Individual Plant Pits

Form with topsoil around each plant by placing a mound of topsoil around the edge of each plant pit. Watering basins must be 6 inches deep for trees and 4 inches deep for shrubs. Construct watering basin in a 4-1/2 foot diameter circle around specimen (not planted in a close group) trees and shrubs.

3.5.4 Tree Wrapping and Protection

Wrapping material shall be horticulturally approved waterproof wrapping paper. Wrapping shall be applied from the base of the tree to the second branch and secured with tape. Wrapping shall be done in the fall months prior to freeze and removed in the spring. It shall be the Contractor's responsibility to ensure wrapping does not remain on the trees in the summer months. In addition, each tree shall be surrounded by a hoop of metal mesh or hardware cloth staked or anchored at ground level, 4 feet high and 1 foot in diameter, for protection from beavers.

3.5.5 Weed Control Barrier

Weed control barrier shall be installed around each planting to prevent competition with other plants and weeds. An approximately 3 foot square piece of weed control barrier shall be cut and secured with landscape staples around each tree and shrub.

3.5.6 Tree and Shrub Caging

All containerized trees and shrubs 5 gallon size and under shall be caged with hardware cloth to prevent small mammal herbivory. Hardware cloth shall be 1/8 11 to 1/4 11 size openings. Each planting shall be surrounded by a hoop of hardware cloth be cut to one foot (1') high and enough length to completely circle the base of the plant with space allowing for two to three years of growth. Caging shall be secured to the ground with landscape staples and hardware cloth shall be secured above ground with zip ties or cable ties.

3.5.7 Erosion Control Material

Install in accordance with manufacturer's instructions.

3.5.8 Mulch Topdressing

Provide mulch topdressing over entire planter bed surfaces and individual plant surfaces including earth mound watering basin around plants to a depth of 3 inches after completion of plant installation and before watering. Keep mulch out of the crowns of shrubs. Place mulch a minimum 2 to 3 inches away from trunk of shrub or tree. Place on top of any weed control fabric.

3.5.9 Watering

Start watering areas planted as required by temperature and wind conditions. Apply water at a rate sufficient to ensure thorough wetting of soil to a depth of 12 inches without run off.

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3.5.10 Staking and Guying

3.5.10.1 Staking

Stake plants with the number of stakes indicated complete with double strand of 12 gage guy wire as detailed. Attach guy wire half the tree height but not more than 5 feet high. Drive stakes to a depth of 2-1/2 to 3 feet into the ground outside the plant pit. Do not injure the root ball.

Use hose chafer guards where guy wire comes in contact with tree trunk.

3.5.10.2 Guying

Guy plants as indicated. Attach two strands of guying wire around the tree trunk at an angle of 45 degrees at approximately 1/2 of the trunk height.

Protect tree trunks with chafing guards where guying wire contacts the tree trunk. Anchor guys to wood ground stakes. Fasten flags to each guying wire approximately 2/3 of the distance up from ground level.

3.5.10.3 Chafing Guards

Use hose chafing guards, as specified where guy wire will contact the plant.

3.5.10.4 Wood Ground Stakes

Drive wood ground stakes into firm ground outside of plant pit with top of stake flush with ground. Place equal distance from tree trunk and around the plant pit.

3.5.10.5 Flags

Securely fasten flags on each guy wire approximately two-thirds of the distance up from ground level.

3.5.11 Pruning

Prune in accordance with safety requirement of TCIA Z133.

3.5.11.1 Trees and Shrubs

Remove dead and broken branches. Prune to correct structural defects only.

Retain typical growth shape of individual plants with as much height and spread as practical. Do not cut central leader on trees. Make cuts with sharp instruments. Do not flush cut with trunk or adjacent branches.

Collars must remain in place. Pruning must be accomplished by trained and experienced personnel and must be accordance with TCIA A300P1.

3.5.11.2 Wound Dressing

Do not apply tree wound dressing to cuts.

3.6 MAINTENANCE DURING PLANTING OPERATION

Installed plant material shall be maintained in a healthy growing condition. Maintenance operations shall begin immediately after each plant is installed to prevent desiccation and shall continue until the plant establishment period ends. Installed areas shall be kept free of weeds, grass, and other undesired vegetation. The maintenance includes watering, adjusting settling, and maintaining staking materials. All staking materials removed after two growing seasons or as directed by the

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Contracting Officer's Representative.

3.7 RESTORATION AND CLEAN UP

3.7.1 Restoration

Turf areas, pavements and facilities that have been damaged from the planting operation must be restored to original condition at the Contractor's expense.

3.7.2 Clean Up

Excess and waste material must be removed from the installed area and must be disposed offsite at an approved disposal area.

-- End of Section --

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Attachment 2 Drawing L-101, Tree Mitigation Planting Area

Standard